1994-05-26 05:23:31 +00:00
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.\" Copyright (c) 1985, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)iostat.8 8.1 (Berkeley) 6/6/93
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.\"
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.Dd June 6, 1993
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.Dt IOSTAT 8
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.Os BSD 4
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.Sh NAME
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.Nm iostat
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.Nd report
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.Tn I/O
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statistics
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.Sh SYNOPSIS
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.Nm iostat
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.Op Fl c Ar count
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.Op Fl M Ar core
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.Op Fl N Ar system
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.Op Fl w Ar wait
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.Op Ar drives
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.Sh DESCRIPTION
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.Nm Iostat
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displays kernel
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.Tn I/O
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statistics on terminal, disk and cpu
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operations.
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.Pp
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The options are as follows:
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.Bl -tag -width flag
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.It Fl c
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Repeat the display
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.Ar count
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times.
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The first display is for the time since a reboot and each subsequent
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report is for the time period since the last display.
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If no
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.Ar wait
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interval is specified, the default is 1 second.
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.It Fl M
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Extract values associated with the name list from the specified core
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instead of the default
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.Dq Pa /dev/kmem .
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.It Fl N
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Extract the name list from the specified system instead of the default
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.Dq Pa /kernel .
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.It Fl w
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Pause
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.Ar wait
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seconds between each display.
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If no repeat
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.Ar count
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is specified, the default is infinity.
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.El
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.Pp
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.Nm Iostat
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displays its information in the following format:
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.Bl -tag -width flag
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.It tty
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.Bl -tag -width indent -compact
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.It tin
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characters read from terminals
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.It tout
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characters written to terminals
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.El
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.It disks
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Disk operations (this field is system dependent).
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The header of the field is the disk name and unit number.
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If more than four disk drives are configured in the system,
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.Nm iostat
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displays only the first four drives.
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To force
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.Nm iostat
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to display specific drives, their names may be supplied on the command
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line.
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.Pp
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.Bl -tag -width indent -compact
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.It sps
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sectors transferred per second
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.It tps
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transfers per second
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.It msps
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milliseconds per average seek (including implied
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seeks and rotational latency)
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.El
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.It cpu
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.Bl -tag -width indent -compact
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.It \&us
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% of cpu time in user mode
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.It \&ni
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% of cpu time in user mode running niced processes
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.It \&sy
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% of cpu time in system mode
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.It \&in
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% of cpu time in interrupt mode
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1994-05-26 05:23:31 +00:00
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.It \&id
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% of cpu time in idle mode
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.El
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.El
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.Sh FILES
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.Bl -tag -width /dev/kmem -compact
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1994-08-05 09:14:37 +00:00
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.It Pa /kernel
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1994-05-26 05:23:31 +00:00
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Default kernel namelist.
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.It Pa /dev/kmem
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Default memory file.
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.El
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.Sh SEE ALSO
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.Xr fstat 1 ,
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.Xr netstat 1 ,
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.Xr nfsstat 1 ,
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.Xr \&ps 1 ,
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.Xr systat 1 ,
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.Xr vmstat 1 ,
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.Xr pstat 8
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.Pp
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The sections starting with ``Interpreting system activity'' in
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.%T "Installing and Operating 4.3BSD" .
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